00001 /* ScummVM - Graphic Adventure Engine00002 *00003 * ScummVM is the legal property of its developers, whose names00004 * are too numerous to list here. Please refer to the COPYRIGHT00005 * file distributed with this source distribution.00006 *00007 * This program is free software; you can redistribute it and/or00008 * modify it under the terms of the GNU General Public License00009 * as published by the Free Software Foundation; either version 200010 * of the License, or (at your option) any later version.00011 *00012 * This program is distributed in the hope that it will be useful,00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the00015 * GNU General Public License for more details.00016 *00017 * You should have received a copy of the GNU General Public License00018 * along with this program; if not, write to the Free Software00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.00020 *00021 */00022
00023 // Based on eos' Huffman code00024
00025 #include "common/huffman.h"00026 #include "common/util.h"00027 #include "common/textconsole.h"00028 #include "common/bitstream.h"00029
00030 namespace Common {
00031
00032Huffman::Symbol::Symbol(uint32 c, uint32 s) : code(c), symbol(s) {
00033 }
00034
00035
00036Huffman::Huffman(uint8 maxLength, uint32 codeCount, constuint32 *codes, constuint8 *lengths, constuint32 *symbols) {
00037 assert(codeCount > 0);
00038
00039 assert(codes);
00040 assert(lengths);
00041
00042 if (maxLength == 0)
00043 for (uint32 i = 0; i < codeCount; i++)
00044 maxLength = MAX(maxLength, lengths[i]);
00045
00046 assert(maxLength <= 32);
00047
00048 _codes.resize(maxLength);
00049 _symbols.resize(codeCount);
00050
00051 for (uint32 i = 0; i < codeCount; i++) {
00052 // The symbol. If none were specified, just assume it's identical to the code index00053 uint32 symbol = symbols ? symbols[i] : i;
00054
00055 // Put the code and symbol into the correct list00056 _codes[lengths[i] - 1].push_back(Symbol(codes[i], symbol));
00057
00058 // And put the pointer to the symbol/code struct into the symbol list.00059 _symbols[i] = &_codes[lengths[i] - 1].back();
00060 }
00061 }
00062
00063Huffman::~Huffman() {
00064 }
00065
00066voidHuffman::setSymbols(constuint32 *symbols) {
00067 for (uint32 i = 0; i < _symbols.size(); i++)
00068 _symbols[i]->symbol = symbols ? *symbols++ : i;
00069 }
00070
00071 } // End of namespace Common
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